CN103265025A - Method for preparing biomass conductive charcoal electromagnetic shielding material - Google Patents
Method for preparing biomass conductive charcoal electromagnetic shielding material Download PDFInfo
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- CN103265025A CN103265025A CN2013101602189A CN201310160218A CN103265025A CN 103265025 A CN103265025 A CN 103265025A CN 2013101602189 A CN2013101602189 A CN 2013101602189A CN 201310160218 A CN201310160218 A CN 201310160218A CN 103265025 A CN103265025 A CN 103265025A
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Abstract
The invention discloses a method for preparing a biomass conductive charcoal electromagnetic shielding material. The method comprises the following steps of: firstly, using a nickel-based or iron-based compound as a main catalyst and using a calcium-based compound as a cocatalyst to prepare a catalyst, then low-temperature carbonizing biomass conductive charcoal under 480-520 DEG C, cooling and taking out the catalyst and the biomass conductive charcoal, fully mixing the catalyst and the biomass conductive charcoal, high-temperature carbonizing the biomass conductive charcoal under 800-1000 DEG C, and further pretreating the biomass conductive charcoal, to obtain final biomass conductive charcoal. After the biomass conductive charcoal, a resin and a solvent are uniformly mixed according to a mass ratio of 4-10: 1:1-3, a mixture liquid is poured into a stainless steel die with thickness being 1-15mm, the mixture liquid is cured and formed under a constant pressure of 1-20MPa for 0.5-5h, and then the biomass electromagnetic shielding material is obtained after demolded. The method for preparing the electromagnetic shielding material has advantages of good adaptability on raw materials, stable quality and large potential.
Description
Technical field
The present invention relates to the preparation method of electromagnetic shielding material, relate in particular to a kind of preparation method of biomass conductive carbon electromagnetic shielding material.
Background technology
Biomass are typical renewable resourcess, and the carbon that annual plant is fixed up by photosynthesis is up to 2 * 10
11T, energy are 3 * 10
21The sun power that J, annual photosynthesis are stored in the plant can provide the whole world energy requirement in 10 years.Plant as renewable resources because it is evenly distributed, environmental protection, do not increase greenhouse gases and obtained widely using.Research and development to its application method had become one of great heat subject in the world already, and were subjected to national governments and scientist's extensive concern.According to United Nations Environment Programme (UNEP) (UNEP) statistics, the stalk that produces every year of various farm crop is up to 1,700,000,000 tons in the world, and wherein major part does not obtain utilizing.China is large agricultural country, and stalk output accounts for about 30% of whole world stalk total amount.In addition, the bamboo wood output of China accounts for 1/3rd of world's bamboo wood ultimate production, and bamboo wood has approximately later in processing and becomes trade waste more than 60%.China's Mineral resources and forest products resource per capita is few, how to effectively utilize the pressing problem that these industrial wastes have become the biomass comprehensive utilization.
Along with developing rapidly of science and technology, the equipment of electromagnetic energy and technology obtain utilizing at each face of each side of people's life; People bring the huge while easily in enjoyment interchange and Economic development, and these household electrical appliance, electronics in use all can produce the electromagnetic radiation of different wave length and intensity to some extent.And these electromagnetic radiation as wavess are full of whole human lives's space, become the another source of pollution outside water, gas, the noise, i.e. the 4th source of pollution of people's common name.Show according to data, electromagnetic radiation has become one of etiology of current harm humans Community health, the plant and instrument mishandle that causes owing to electromagnetic interference, information transmission interruption etc. all can cause huge loss to society equally, and electromagnetic interference and signal leak and may cause immeasurable loss in political, military, diplomatic, economic dispatch field.Therefore, the positive paid more and more attention of the harm that electromagnetic radiation pollution causes, the research of carrying out electromagnetic shielding material preparation technology has important significance for theories and using value.
Electromagnetic shielding is the effective means of control electromagnetic pollution.In general, the resistivity of material is more little, and capability of electromagnetic shielding is also just more good.Therefore, people often utilize metals such as silver, copper, nickel, zinc as the raw material of electro-magnetic screen layer.Traditional metal matrix electromagnetic shielding material cost height, stock number are limited, are difficult to satisfy the growing market requirement, and investigators are actively seeking more cheap, environmental protection and resourceful electromagnetic shielding material always.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of preparation method of biomass conductive carbon electromagnetic shielding material is provided.
The preparation method of biomass conductive carbon electromagnetic shielding material may further comprise the steps:
The first step is Primary Catalysts with Ni-based or Fe-base compound, is catalyst aid with the calcium based compound, the catalyzer that is configured to according to mixed Primary Catalysts and the promotor of mass ratio 1:0.5～4;
Second step, remove the impurity in the biomass after, with the granular particle of the broken screening of biomass particle diameter 1～15mm, send in the charring furnace, under the temperature rise rate of 1～30 ℃/min, be heated to 480 ℃～520 ℃ and carry out low-temperature carbonization, and under the atmosphere of nitrogen, keep this temperature 1～3h, cooling;
In the 3rd step, the biomass conductive carbon that low-temperature carbonization is obtained takes out in stove, and it is even that biomass conductive carbon and catalyzer are pressed the mixed of mass ratio 50～200:1;
In the 4th step, with being mixed with the raw material of the biomass conductive carbon of catalyzer as high temperature carbonization, send in the charring furnace, under the heating rate of 1～50 ℃/min, be heated to 800～1000 ℃ and carry out high temperature carbonization, and under the atmosphere of nitrogen, keep this temperature 1～3h, cooling;
The 5th step, cooled biomass conductive carbon fully mixed in acid solution stirs, treat the impurity in the flush away biomass conductive carbon after, filtration drying obtains final biomass conductive carbon.
In the 6th step, cooled biomass conductive carbon and resin and the solvent mass ratio by 4～10:1:1～3 is mixed, and make the mixed solution that mixes in stirred in water bath;
The 7th step, mixed solution is slowly poured in the stainless mould that thickness is 1～15mm, constant voltage 0.5～5h under the pressure of 1～20MPa puts into baking oven then and solidifies cooling forming, and demoulding taking-up obtains demoulding taking-up and obtains this electromagnetic shielding material.
The present invention is intended to utilize the biomass material of originating widely to produce electromagnetic shielding material, improves biomass as resources and utilizes grade, and the protection environment is saved Nonrenewable resources.Preparation method biomass material wide material sources of the present invention can utilize agricultural stalk, forestry waste material, bamboo wood, industrial biomass waste material etc.
Compared with prior art, the present invention has following advantage:
1) method of the biomass conductive carbon of the present invention's preparation is good to adaptability to raw material, can extensively be suitable for agricultural stalk, forestry waste material, bamboo wood, industrial biomass waste material etc.; The preparation process energy consumption is low, and final carbonization temperature has only 800～1000 ℃, and than low about 200 ℃ of prior art, energy efficient is more than 20%.
2) (30MHz～1.5GHz) shield effectiveness is preferably arranged, electromagnet shield effect can reach 20～60dB to the electromagnetic shielding material that makes of the present invention, has reached general instrument to the requirement of shielding material to the hertzian wave of Mid Frequency and high band.
3) the biomass conductive carbon electromagnetic shielding material that makes of the present invention is compared the metal electromagnetic shielding material, has better permeability, has increased the antioxidant property of moisture conditions.
4) biomass conductive carbon electromagnetic shielding material preparation method of the present invention, low cost of manufacture, environmental friendliness are mainly utilized renewable raw materials such as biomass, and stock number is big, can satisfy the growing market requirement.
Description of drawings
Fig. 1 is biomass conductive carbon electromagnetic shielding material production technique figure;
The preparation method of biomass conductive carbon electromagnetic shielding material may further comprise the steps:
The first step is Primary Catalysts with Ni-based or Fe-base compound, is catalyst aid with calcium oxide or carbide of calcium, the catalyzer that is configured to according to mixed Primary Catalysts and the promotor of mass ratio 1:0.5～4;
Second step, remove the impurity in the biomass after, with the granular particle of the broken screening of biomass particle diameter 1～15mm, send in the charring furnace, under the temperature rise rate of 1～30 ℃/min, be heated to 480 ℃～520 ℃ and carry out low-temperature carbonization, and under the atmosphere of nitrogen, keep this temperature 1～3h, cooling;
In the 3rd step, the biomass conductive carbon that low-temperature carbonization is obtained takes out in stove, and it is even that biomass conductive carbon and catalyzer are pressed the mixed of mass ratio 50～200:1;
In the 4th step, with being mixed with the raw material of the biomass conductive carbon of catalyzer as high temperature carbonization, send in the charring furnace, under the heating rate of 1～50 ℃/min, be heated to 800～1000 ℃ and carry out high temperature carbonization, and under the atmosphere of nitrogen, keep this temperature 1～3h, cooling;
The 5th step, cooled biomass conductive carbon fully mixed in acid solution stirs, treat the impurity in the flush away biomass conductive carbon after, filtration drying obtains final biomass conductive carbon.
In the 6th step, cooled biomass conductive carbon and resin and the solvent mass ratio by 4～10:1:1～3 is mixed, and make the mixed solution that mixes in stirred in water bath;
The 7th step, mixed solution is slowly poured in the stainless mould that thickness is 1～15mm, constant voltage 0.5～5h under the pressure of 1～20MPa puts into baking oven then and solidifies cooling forming, and demoulding taking-up obtains demoulding taking-up and obtains this electromagnetic shielding material.
Embodiment 1
The first step is Primary Catalysts with the Z 250, is catalyst aid with carbide of calcium, the catalyzer that is configured to according to mixed Primary Catalysts and the promotor of mass ratio 1:0.5;
Second step, remove the impurity in the straw after, with the granular particle of the broken screening of straw particle diameter 1mm, send in the charring furnace, under the temperature rise rate of 1 ℃/min, be heated to 480 ℃ and carry out low-temperature carbonization, and keep this temperature 0.5h, cooling;
In the 3rd step, the biomass conductive carbon that low-temperature carbonization is obtained takes out in stove, and it is even that biomass conductive carbon and catalyzer are pressed mass ratio 50:1 mixed;
The 4th step, with being mixed with the raw material of the biomass conductive carbon of catalyzer as high temperature carbonization, send in the charring furnace, under the heating rate of 1 ℃/min, be heated to 800 ℃ of capable high temperature carbonizations, and under this temperature, kept 1 hour, cooling;
The 5th step, cooled biomass conductive carbon fully mixed in salpeter solution stirs, treat the impurity in the flush away biomass conductive carbon after, filtration drying obtains final biomass conductive carbon.
In the 6th step, cooled biomass conductive carbon and PEO resin and the water mass ratio by 1:1:5 is mixed, and make the mixed solution that mixes in stirred in water bath;
The 7th step, mixed solution is slowly poured in the stainless mould that thickness is 1mm, constant voltage 0.5h under the pressure of 1MPa puts into the moulding of baking oven cooling curing then, and the demoulding obtains demoulding taking-up and obtains this electromagnetic shielding material.
The productive rate of the biomass conductive carbon that obtains is 38% of raw materials quality, and the volume specific resistance of depressing of 780N is 0.1 Ω cm, and when frequency arrived 1.5GHz at 30MHz, electromagnet shield effect can reach 25～32dB usually.
Embodiment 2
The first step is Primary Catalysts with the nickel acetate, is catalyst aid with carbide of calcium, the catalyzer that is configured to according to mixed Primary Catalysts and the promotor of mass ratio 1:4;
Second step, remove the impurity in the straw after, with the granular particle of the broken screening of straw particle diameter 15mm, send in the charring furnace, under the temperature rise rate of 30 ℃/min, be heated to 520 ℃ and carry out low-temperature carbonization, and keep this temperature 10h, cooling;
In the 3rd step, the biomass conductive carbon that low-temperature carbonization is obtained takes out in stove, and biomass conductive carbon and catalyzer is even by the mixed of quality 200:1;
The 4th step, with being mixed with the raw material of the biomass conductive carbon of catalyzer as high temperature carbonization, send in the charring furnace, under 100 ℃ heating rate, be heated to 1000 ℃ and carry out high temperature carbonization, and under this temperature, keep 2h, cooling;
The 5th step, cooled biomass conductive carbon fully mixed in sulphuric acid soln stirs, treat the impurity in the flush away biomass conductive carbon after, filtration drying obtains final biomass conductive carbon.
The 6th step, cooled biomass conductive carbon and resol and the ethanol mass ratio by 4:1:10 is mixed, and the mixed solution that obtains mixing in stirred in water bath;
In the 7th step, slowly pouring mixed solution into thickness is in the stainless mould of 15mm, and constant voltage 5h under the pressure of 20MPa puts into the baking oven curing molding then, cooling, and demoulding taking-up obtains demoulding taking-up and obtains this electromagnetic shielding material.
The productive rate of the biomass conductive carbon that obtains is 28% of raw materials quality, and the volume specific resistance of depressing of 780N is 0.05 Ω cm, and when frequency arrived 1.5GHz at 30MHz, electromagnet shield effect can reach 35～38dB usually.
Embodiment 3
The first step is Primary Catalysts with the ferric oxide, is catalyst aid with the calcium oxide, the catalyzer that is configured to according to mass ratio 1:2 mixed Primary Catalysts and promotor;
Second step, remove the impurity in the corn stalk after, with the granular particle of the broken screening of corn stalk particle diameter 8mm, send in the charring furnace, under 15 ℃/min temperature rise rate, be heated to 500 ℃ and carry out low-temperature carbonization, and keep this temperature 5h cooling;
In the 3rd step, the biomass conductive carbon that low-temperature carbonization is obtained takes out in stove, and it is even that biomass conductive carbon and catalyzer are pressed the mixed of mass ratio 100:1;
The 4th step, with being mixed with the raw material of the biomass conductive carbon of catalyzer as high temperature carbonization, send in the charring furnace, under the heating rate of 50 ℃/min, be heated to 900 ℃ and carry out high temperature carbonization, and under this temperature, keep 1.5 hours, cooling;
The 5th step, cooled biomass conductive carbon fully mixed in hydrochloric acid soln stirs, treat the impurity in the flush away biomass conductive carbon after, filtration drying obtains final biomass conductive carbon.
In the 6th step, cooled biomass conductive carbon and urea-formaldehyde resin and the acetonitrile mass ratio by 2:1:8 is mixed, and make the mixed solution that mixes in stirring in water bath;
In the 7th step, slowly pouring mixed solution into thickness is in the stainless mould of 8mm, and constant voltage 3h under the pressure of 10MPa puts into the baking oven curing molding then, cooling, and demoulding taking-up obtains demoulding taking-up and obtains this electromagnetic shielding material.
The productive rate of the biomass conductive carbon that obtains is 30% of raw materials quality, and the volume specific resistance of depressing of 780N is 0.08 Ω cm, and when frequency arrived 1.5GHz at 30MHz, electromagnet shield effect can reach 34～36dB usually.
Embodiment 4
The first step is Primary Catalysts with the nickel oxide, is catalyst aid with carbide of calcium, the catalyzer that is configured to according to mass ratio 1:2 mixed Primary Catalysts and promotor;
Second step, remove the impurity in the bamboo after, with the granular particle of the broken screening of bamboo particle diameter 10mm, send in the charring furnace, under 10 ℃/min temperature rise rate, be heated to 500 ℃ and carry out low-temperature carbonization, and keep this temperature 5h cooling;
In the 3rd step, the biomass conductive carbon that low-temperature carbonization is obtained takes out in stove, and it is even that biomass conductive carbon and catalyzer are pressed the mixed of mass ratio 100:1;
The 4th step, with being mixed with the raw material of the biomass conductive carbon of catalyzer as high temperature carbonization, send in the charring furnace, under the heating rate of 10 ℃/min, be heated to 900 ℃ and carry out high temperature carbonization, and under this temperature, keep 1.5 hours, cooling;
The 5th step, cooled biomass conductive carbon fully mixed in sulphuric acid soln stirs, treat the impurity in the flush away biomass conductive carbon after, filtration drying obtains final biomass conductive carbon.
In the 6th step, cooled biomass conductive carbon and ABS resin and the ethyl acetate mass ratio by 2:1:8 is mixed, and make the mixed solution that mixes in stirring in water bath;
In the 7th step, slowly pouring mixed solution into thickness is in the stainless mould of 10mm, and constant voltage 3h under the pressure of 15MPa puts into the baking oven curing molding then, and cooling, the demoulding are taken out and obtained this electromagnetic shielding material.
The productive rate of the biomass conductive carbon that obtains is 32% of raw materials quality, and the volume specific resistance of depressing of 780N is 0.06 Ω cm, and when frequency arrived 1.5GHz at 30MHz, electromagnet shield effect can reach 42～47dB usually.
Embodiment 5
The first step is Primary Catalysts with the iron acetate, is catalyst aid with the calcium oxide, the catalyzer that is configured to according to mass ratio 1:3 mixed Primary Catalysts and promotor;
Second step, remove the impurity in the cotton bar after, with the granular particle of the broken screening of cotton bar particle diameter 8mm, send in the charring furnace, under 15 ℃/min temperature rise rate, be heated to 500 ℃ and carry out low-temperature carbonization, and keep this temperature 5h cooling;
In the 3rd step, the biomass conductive carbon that low-temperature carbonization is obtained takes out in stove, and it is even that biomass conductive carbon and catalyzer are pressed the mixed of mass ratio 100:1;
The 4th step, with being mixed with the raw material of the biomass conductive carbon of catalyzer as high temperature carbonization, send in the charring furnace, under the heating rate of 50 ℃/min, be heated to 900 ℃ and carry out high temperature carbonization, and under this temperature, keep 1.5 hours, cooling;
The 5th step, cooled biomass conductive carbon fully mixed in hydrochloric acid soln stirs, treat the impurity in the flush away biomass conductive carbon after, filtration drying obtains final biomass conductive carbon.
In the 6th step, cooled biomass conductive carbon and Resins, epoxy and the ritalin mass ratio by 2:1:8 is mixed, and make the mixed solution that mixes in stirring in water bath;
In the 7th step, slowly pouring mixed solution into thickness is in the stainless mould of 8mm, and constant voltage 3h under the pressure of 10MPa puts into the baking oven curing molding then, cooling, and demoulding taking-up obtains demoulding taking-up and obtains this electromagnetic shielding material.
The productive rate of the biomass conductive carbon that obtains is 31% of raw materials quality, and the volume specific resistance of depressing of 780N is 0.09 Ω cm, and when frequency arrived 1.5GHz at 30MHz, electromagnet shield effect can reach 31～34dB usually.
Embodiment 6
The first step is Primary Catalysts with the nickel hydroxide, is catalyst aid with the calcium oxide, the catalyzer that is configured to according to mass ratio 1:3 mixed Primary Catalysts and promotor;
Second step, remove the impurity in the soybean bar after, with the granular particle of the broken screening of soybean bar particle diameter 8mm, send in the charring furnace, under 10 ℃/min temperature rise rate, be heated to 500 ℃ and carry out low-temperature carbonization, and keep this temperature 5h cooling;
In the 3rd step, the biomass conductive carbon that low-temperature carbonization is obtained takes out in stove, and it is even that biomass conductive carbon and catalyzer are pressed the mixed of mass ratio 100:1;
The 4th step, with being mixed with the raw material of the biomass conductive carbon of catalyzer as high temperature carbonization, send in the charring furnace, under the heating rate of 50 ℃/min, be heated to 900 ℃ and carry out high temperature carbonization, and under this temperature, keep 1.5 hours, cooling;
The 5th step, cooled biomass conductive carbon fully mixed in hydrochloric acid soln stirs, treat the impurity in the flush away biomass conductive carbon after, filtration drying obtains final biomass conductive carbon.
In the 6th step, cooled biomass conductive carbon and polyvinyl chloride and the hexanaphthene mass ratio by 2:1:8 is mixed, and make the mixed solution that mixes in stirring in water bath;
In the 7th step, slowly pouring mixed solution into thickness is in the stainless mould of 6mm, and constant voltage 3h under the pressure of 10MPa puts into the baking oven curing molding then, cooling, and demoulding taking-up obtains demoulding taking-up and obtains this electromagnetic shielding material.
The productive rate of the biomass conductive carbon that obtains is 30% of raw materials quality, and the volume specific resistance of depressing of 780N is 0.07 Ω cm, and when frequency arrived 1.5GHz at 30MHz, electromagnet shield effect can reach 31～36dB usually.
Claims (6)
1. the preparation method of a biomass conductive carbon electromagnetic shielding material is characterized in that: may further comprise the steps:
The first step is Primary Catalysts with Ni-based or Fe-base compound, is catalyst aid with the calcium based compound, the catalyzer that is configured to according to mixed Primary Catalysts and the promotor of mass ratio 1:0.5～4;
Second step, remove the impurity in the biomass after, with the granular particle of the broken screening of biomass particle diameter 1～15mm, send in the charring furnace, under the temperature rise rate of 1～30 ℃/min, be heated to 480 ℃～520 ℃ and carry out low-temperature carbonization, and under the atmosphere of nitrogen, keep this temperature 1～3h, cooling;
In the 3rd step, the biomass conductive carbon that low-temperature carbonization is obtained takes out in stove, and it is even that biomass conductive carbon and catalyzer are pressed the mixed of mass ratio 50～200:1;
In the 4th step, with being mixed with the raw material of the biomass conductive carbon of catalyzer as high temperature carbonization, send in the charring furnace, under the heating rate of 1～50 ℃/min, be heated to 800～1000 ℃ and carry out high temperature carbonization, and under the atmosphere of nitrogen, keep this temperature 1～3h, cooling;
The 5th step, cooled biomass conductive carbon fully mixed in acid solution stirs, treat the impurity in the flush away biomass conductive carbon after, filtration drying obtains final biomass conductive carbon;
In the 6th step, cooled biomass conductive carbon and resin and the solvent mass ratio by 4～10:1:1～3 is mixed, and make the mixed solution that mixes in stirred in water bath;
The 7th step, mixed solution is slowly poured in the stainless mould that thickness is 1～15mm, constant voltage 0.5～5h under the pressure of 1～20MPa puts into baking oven then and solidifies cooling forming, and the demoulding is taken out and is obtained this electromagnetic shielding material.
2. the preparation method of a kind of biomass conductive carbon electromagnetic shielding material as claimed in claim 1 is characterized in that, described Ni-based or Fe-base compound is: nickel oxide or nickel hydroxide or nickel acetate or ferric oxide or iron acetate or Z 250; Described calcium based compound is calcium oxide or calcium carbonate.
3. the preparation method of a kind of biomass conductive carbon electromagnetic shielding material as claimed in claim 1 is characterized in that, described biomass are: straw or bamboo or cotton stalk or corn stalk or straw or soybean bar.
4. the preparation method of a kind of biomass conductive carbon electromagnetic shielding material as claimed in claim 1 is characterized in that, described resin is: PEO resin, resol, ABS resin, urea-formaldehyde resin, Resins, epoxy or polyvinyl chloride.
5. the preparation method of a kind of biomass conductive carbon electromagnetic shielding material as claimed in claim 1 is characterized in that, described solvent is: water, acetonitrile, ethanol, ethyl acetate, ritalin or hexanaphthene.
6. the preparation method of a kind of biomass conductive carbon electromagnetic shielding material as claimed in claim 1 is characterized in that, described acid solution is: nitric acid, hydrochloric acid or sulphuric acid soln.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106520071A (en) * | 2016-12-06 | 2017-03-22 | 吉林大学 | Rice husk based C/magnetic Co particle composite wave absorber and preparation method thereof |
| CN111635601A (en) * | 2020-06-28 | 2020-09-08 | 浙江农林大学 | Preparation method of cheap carbon-based electromagnetic shielding plate |
| CN113980427A (en) * | 2021-11-01 | 2022-01-28 | 陕西工业职业技术学院 | Epoxy resin-based biomass charcoal electromagnetic shielding composite material and preparation method thereof |
| CN114106509A (en) * | 2021-12-08 | 2022-03-01 | 常熟东南塑料有限公司 | High-strength electromagnetic shielding phenolic molding plastic |
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| CN101264879A (en) * | 2008-04-22 | 2008-09-17 | 东南大学 | Method for preparing biomass conductive charcoal |
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| CN101264879A (en) * | 2008-04-22 | 2008-09-17 | 东南大学 | Method for preparing biomass conductive charcoal |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106520071A (en) * | 2016-12-06 | 2017-03-22 | 吉林大学 | Rice husk based C/magnetic Co particle composite wave absorber and preparation method thereof |
| CN106520071B (en) * | 2016-12-06 | 2018-05-25 | 吉林大学 | Rice husk base carbon/magnetism Co particle composite wave-absorbing agent and preparation method thereof |
| CN111635601A (en) * | 2020-06-28 | 2020-09-08 | 浙江农林大学 | Preparation method of cheap carbon-based electromagnetic shielding plate |
| CN113980427A (en) * | 2021-11-01 | 2022-01-28 | 陕西工业职业技术学院 | Epoxy resin-based biomass charcoal electromagnetic shielding composite material and preparation method thereof |
| CN114106509A (en) * | 2021-12-08 | 2022-03-01 | 常熟东南塑料有限公司 | High-strength electromagnetic shielding phenolic molding plastic |
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Application publication date: 20130828 |